This site is supported by donations to The OEIS Foundation.

 Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS". Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A027866 Numbers n such that n^2 + (n+1)^2 + (n+2)^2 + (n+3)^2 + (n+4)^2 + (n+5)^2 is prime. 6
 2, 3, 4, 9, 12, 13, 18, 19, 21, 23, 24, 32, 34, 38, 48, 51, 52, 56, 62, 63, 81, 82, 87, 96, 97, 102, 104, 109, 119, 128, 142, 146, 152, 158, 159, 164, 166, 167, 199, 212, 214, 217, 219, 221, 223, 224, 229, 233, 236, 238, 249, 251, 258, 269, 273, 277, 284, 291, 296 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Numbers n such that 55 + 30n + 6n^2 is prime. - Zak Seidov, May 20 2014 LINKS Zak Seidov, Table of n, a(n) for n = 1..10000 P. De Geest, World!Of Numbers MATHEMATICA Select[Range[6!], PrimeQ[#^2 + (# + 1)^2 + (# + 2)^2 + (# + 3)^2 + (# + 4)^2 + (# + 5)^2] &] (* Vladimir Joseph Stephan Orlovsky, Dec 20 2009 *) PROG (MAGMA) [n: n in [0..400] | IsPrime(55+30*n+6*n^2)]; // Vincenzo Librandi, Nov 18 2010 (PARI) is(n)=isprime(n^2+(n+1)^2+(n+2)^2+(n+3)^2+(n+4)^2+(n+5)^2) \\ Charles R Greathouse IV, Feb 17 2017 CROSSREFS Sequence in context: A125774 A062410 A145772 * A283596 A281992 A100902 Adjacent sequences:  A027863 A027864 A027865 * A027867 A027868 A027869 KEYWORD nonn AUTHOR STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.